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' W. H. LINDSAY. V COIL CLUTCH AND BRAKE.

No. 577,961. y' Patented Mar. 2', 1897.

UNITED STATES PATENT OEErcE.

WILLIAM HENRY LINDSAY, OF BRISTOL, ENGLAND.

COIL CLUTCH AND BRAKE.

SPECIFICATION forming pail: of Letters Patent No. 577,961, dated March 2, 1897.

Application filed May 7, 1896. Serial No. 590,531. (No model.)

To @ZZ whom t may concern:

Beit known that I, WILLTAM HENRY LIND- SAY, a subject of the Queenof Great Britain and Ireland, residing at Bristol, England, have invented an Improved Coil Olutch and Brake and Reversing-Gear for Winding and Hauling Engines, in part applicable to clutchpulleys and shaft-couplings, of which the following is a specification.

This invention consists in an improved coil clutch and brake for winding and hauling engines and in reversing-gear for the same. The coil is also applicable to clutch-pulleys and to coupling-shafts.

As arranged as a clutch for a winding and hauling engine and to serve also as a brake therefor, a coil of steel or other suitable metal is wrapped around the winding-drurn shaft or a bush keyed thereon. The coil preferably tapers in opposite directions from a central head which engages in a recess provided for it in a saddle secured to the drum, thus making it a double drive-coil. The coil is' carried on the drum, and when desired is made to bind upon the bush or boss by moving in the proper direction a sleeve loosely carried on the drum-shaft and arranged to act through levers upon the tails of the coil. Reverse movement of the sleeve causes the coil to unbind. The coil acts as a clutch in winding and as a brake in lowering without necessitating reversing of the drum-shaft.

Reversing-gear in which coils are employed is applied, and the drum is thereby adapted to raise and lower on either hand, as may be required, without necessitating reversing the engine.

In the accompanying drawings, Figure 1 represents, partly in elevation and partly in section, my coil clutch and brake as applied to the drum of a winding and hauling engine and the combination therewith of reversinggear by means of which the drum is adapted to raise and lower on either hand. Fig. 2 is an under side plan as seen from below the winding-drum. Fig. 3 is a section on the line 00min Fig. l and shows a part of the coil. Fig. 4. is a side view, and Fig. 5 an end view on line #j y, Fig. 4, looking to the left, showing the revolving parts. The remaining {igures sow modifications. Fig. 6 is a side view, par'lly in central vertical section, showing one-half of the double coil and the adjacent parts; and Fig. 7 is an end view of the principal parts thereof. Fig. 8 is a side view, partly in section; Fig. 9, a section quartering thereto; Fig. l0, a section on the line z z in Fig. 9, looking to the left; and Fig. ll is a section corresponding to Fig. 9, but with parts formed integral therewith which allow the device to serve alsoas a pulley.

Similar letters of reference indicate corresponding parts in all the figures where they appear.

The coil b, which consists of one piece of steel or other suitable metal throughout, surrounds a bush c, keyed on the shaft cl of the winding-drum a. The coil b tapers from a central head b in opposite directions and has, therefore, two small ends or tails b2.

Referring to Figs. l, 2, and 3, the head b engages in a recess provided for it in a saddle e, bolted or otherwise secured to the drum a. A lever f, pivoted in a bracket f', bolted to the drum, acts through the screws f2 upon the two tails b2 of the coil b, in which tails the screws bear. The screws f2 are for equalizing the action and for taking up slack in the coil due to wear or other cause. An arm g is connected at one endto the lever f and toward the other end to a rod h, connected to a sleeve z', loose on the drum-shaft cl, on which the sleeve z' is free to be moved axially by means of the rocking shaft t. Movement of the sleeve t' toward the drum a causes the coil b, acted upon at the tails by the lever f through the screws f2, to contract throughout its whole length on the bush c, which, prior to being thus bound, rotates within the coil l). Binding of the coil b on the bush c causes the drum a, previously stationary, to rotate with the shaft cl.

By moving the sleeve i outward on the shaft cZ-that is to say, away from the drum--the coil b is released to a degree which is under control, and hence the coilserves as a brake governingthe drum ory in lowering or unwinding.

The lever f may be fitted with buffer-springs for cushioning the effect of putting the coil p into and out of binding action.

It will be observed thatthe construction relieves the mechanism of any tendency to either tighten or relax the grip of the coil IOO upon the shaft or bush. The double coil arranged according to my invention will always apply at each end or tail of the coil with equal force and will relax the grip at each equally, because the tendency of the motion to tighten the grip on one end or tail of my coil is exactly oifset by the tendency of the motion to induce the opposite effect on the opposite end or tail. The adj ustin g-screwsf2 allow imperfect workmanship and unequal wear to be compensated for with great nicety.

The reversi iig-gear, which enables the d rum ci, to raise and lower on either hand without reversing the driving-shaft of the engine, consists of a train of bevel-wheels 7c 7c' 7a2, of which 7c' is free to rotate on a spindle in a pedestal l. The wheel 7o is keyed upon the drivingshaft CZ', which extends into the hub m. The wheel 7a2 is loose on the drum-shaft d. Between the wheels 7e an d 7a2 is a sleeve n, loosely carried on the shaft ci and free to be moved axially through the medium of the hand-lever n, pivoted in a lug n2, provided on the pedestal Z. Keyed on the driven shaft d., which is capable of being driven in reverse directions, is a bush o, around which is wrapped a steel coil p, which is bolted at the head to the wheel 7e'. On the tail of the coil bears an adjustable screw s, carried by a lever q, pivoted in a bracket 7', bolted to the wheel k. Similarly a coil p is wrapped around a bush 0', keyed on the shaft d. The coil p is connected at the head to the wheel 7a2 and on the tail bears an adjustable screw s', carried by a lever q', pivoted in a bracket r, bolted to the wheel k2. lVhen the sleeve n is in the position shown at Fig. 1, the wheels 7tt are rotated by the driving-shaft CZ and the wheel 7a2 is rotated by the wheel 7s'. The bushes 0 and o are stationary within the coils p p', which revolve around them. Then the sleeve 'n is brought into contact with the lever q, the coil p binds on the bush o and the winding-drum shaft Z and drum a rotate in the same direction as the driving-shaft CZ. Vhen it is required to drive the drum-shaft d in the reverse direction, the sleeve n is withdrawn from contact with the lever q and put into contact with the lever q'. 'lhe coil p then binds on the bush o and the motion of the drum-shaft CZ is reversed.

Reversing may be effected without jar or shock, and, when desirable, the drum may be moved more slowly than the shaft by permit-ting the bushes to slip within the coils by regulating the pressure on the levers q or q', as the case may be, or by correspondingly varying the force applied to the rocking shaft fi, and consequently to the levers ff.

I use the term drum to indicate any part which is to be driven and released, as required. As shown, the drum is adapted for rotating' the shaft and also for winding on its periphery a rope or chain to serve in a hoisting or releasing engine.

A bush need not necessarily be employed, as in some cases the coil or coils may, both as regards the drum and the reversing-gear, be wrapped directly around the shaft.

In Figs. 6 and 7 is illustrated means for putting the coil l) into and out of action through a rack i2, secured to the sleeve t' and carried in a bracket fixed to the shell a. The rack gears with the pinion 3, which is centered in the said bracket and has an internal female screw-thread, which engages with the male-threaded screw it. When by the action of the sleeve i the screw fzis affected, it travels horizontally, being prevented from rotating by the pins taking into the groove longitudinally cut in it. The adjustable screw f2 for taking up the wear of the coil is passed through the coil-tail.

Fig. 8 and succeeding figures illustrate the application of the double drive-coil Z) to a shaft-coupling. The coil b is wrapped around the hollow boss c, keyed on the driving-shaft d. Pivot-ed to the shell t is the lever q, against which bear the adjustable screws f2, screwed through the coil-tails b2. The coil-head b is held to the shell and is kept in place by the gun-metal strap u. The coil is caused to bind on the boss c, previously rotating freely within the coil, by moving the sleeve t' into contact with the lever q. The shell t then rotates an d carries with it the separate shaft CZ', to which it is keyed. Vhen'the sleeve ll is moved away from the lever q, the coil unbinds, and the shell tno longer rotates. A spring s7k assists to return the lever q to its normal position. Q3 is a stop to limit the range of movement of the lever q.

At Fig. ll is illustrated the application of the double drive-coil to a pulley fu. The lever q is of the same kind as shown in Figs. S, 9, and 10, and the coil l), which is held at the head 1)/ to the pulley-shell t and kept in place by the gun-metal strap u, is actuated to bind on the boss c or unbind therefrom by moving the rocking shaft e" and sleeve in the proper direction. The lever q, which through the adjusting-screws f2 acts on the tails of the coil, is pivoted to the shell t and is turned on its pivot by the sleeve fi.

Springs may be arranged to hold the coil in or out of bind, as may be required.

Instead of using one-coil, such as b, two coils may be employed, each tapering from a head to a tail, the heads being secured together midway along the bush c, or the coiltails may meet midway in the bush, the heads being outward.

The coil is not necessarily tapered. In cases where the loads are heavy and driving is fast the coil is preferably of uniform section throughout.

I claim as my inventionl. In mechanism of the class described, a rotary shaft and a drum mounted loosely thereon, in combination with a spring-coil surrounding the shaft and centrally secured to the drum, and provisions connected with the ends of the coil and operable from the o'jtside for torsionally moving said ends t-gftighten IOO IIO

the grip of such coil, all arranged for joint operation substantially as herein specified.

2. In mechanism of the class described, a rotary shaft and a drum mounted loosely thereon, in combination with a double springcoil surrounding the shaft in opposite directions, arranged as shown so that the tendency of one part of the coil to tighten shall be offset by the tendency of the other part of the coil to become relaxed by the friction, and

with provisions connected with the ends of the coil for tightening and relaxing the grip of such coil at will, substantially as herein specified.

3. In mechanism of the class described, a rotary shaft and a drum mounted loosely thereon, in combination with a double springcoil surrounding the shaft, arranged as shown, so that the tendency of one part of the coil to tighten shall be offset by the tendency of the other part of the coil to become relaxed by the friction, and with a lever f turning on a center revolved with the drinn and connected with the ends of the coil and having an arm g, and the rod 71. and its connections for tight-l ening and slackening the grip of both parts of such double coil, all arranged for joint operation substantially as herein specified,

4. In mechanism of the class described, a shaft and a drum mounted loosely thereon, in combination with a double spring-coil surrounding the shaft, arranged as shown so that the tendency of one part of thecoil to tighten shall be offset by the tendency of the other part of the coil to become relaxed by the friction, and with a lever fturning on a center revolved with the drum and connected with the ends of the coil and having an arm g as shown, and the rod h and its connections for tightening and relaxing the grip of both parts of such double coil, and with adj usting-screws f2 to adjust the connection of the lever to the two parts of the coil independently, all arranged for joint operation substantially as herein specified.

5. In mechanism of the class described, a rotary shaft and a drum .mounted loosely thereon, in combination with a spring-coil centrally secured to the part to be driven and surrounding the shaft, andv provisions operable from the outside for torsionally moving the ends of the spring to tighten and relax the grip of the same, and with a separate coupling and controlling means nfor connecting and disconnecting the shaft, all arranged for joint operation substantially as herein specified.

6. In mechanism of the class described, a rotary shaft and a drum mounted loosely thereon, in combination with a spring-coil surrounding the shaft, and provisions operable from the outside for tightening` and relaxing the grip of such coil, and with a separate coupling and controlling means n for connecting and disconnecting the shaft and with the gear-wheels k, lo', k2, for allowing the relative motions of the two parts d, d', of the shaft to be reversed at will, all arranged for joint operation substantially as herein specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

VILLIAM HENRY LINDSAY.

Witnesses:

NICHOLAS WATTS, CHARLES FRENCH. 

